There are more than 12,000 regional checklists in Avibase, offered in 9 different taxonomies, including synonyms more than 175 languages. Each checklist can be viewed with photos shared by the birding community, and also printed as PDF checklists for field use.

Curruca curruca [curruca or caucasica]: breeds Europe east to western Russia (approximately to the Ural Mountains), the Caucasus, Turkey, and western Iran; winters primarily in northeastern Africa, less commonly west to Senegambia

Curruca curruca blythi: E Siberia to n Altai and n Mongolia

Curruca curruca [halimodendri or telengitica]: breeds central Asian steppes, from the lower Ural River and Transcapia east to western Mongolia; primarily winters in southwestern Asia (southeastern Iran to northwestern India), but perhaps also in eastern Africa

Curruca minula [incl. jaxartica]: breeds from Uzbekistan, Turkmenistan and central Iran east through northern Afghanistan and Tajikistan to western China; winters to the south